Genetic Variant DDHD1:p.Asp890Asn (chr14-53046803-C-T) – ACMG Classification: Benign (-13 pts)

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_001160148.2(DDHD1):c.2668G>A(p.Asp890Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000169 in 1,609,372 control chromosomes in the GnomAD database, including 6 homozygotes. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D890H) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00012 ( 1 hom., cov: 32)

Exomes 𝑓: 0.00017 ( 5 hom. )

Consequence

DDHD1
NM_001160148.2 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:1

Conservation

PhyloP100: 0.916

Publications

0 publications found

Variant links:

Genes affected

DDHD1 (HGNC:19714): (DDHD domain containing 1) This gene is a member of the intracellular phospholipase A1 gene family. The protein encoded by this gene preferentially hydrolyzes phosphatidic acid. It is a cytosolic protein with some mitochondrial localization, and is thought to be involved in the regulation of mitochondrial dynamics. Overexpression of this gene causes fragmentation of the tubular structures in mitochondria, while depletion of the gene results in mitochondrial tubule elongation. Deletion of this gene in male mice caused fertility defects, resulting from disruption in the organization of the mitochondria during spermiogenesis. In humans, mutations in this gene have been associated with hereditary spastic paraplegia (HSP), also known as Strumpell-Lorrain disease, or, familial spastic paraparesis (FSP). This inherited disorder is characterized by progressive weakness and spasticity of the legs. Alternative splicing results in multiple transcript variants encoding different isoforms. [provided by RefSeq, Aug 2015]

DDHD1 Gene-Disease associations (from GenCC):

hereditary spastic paraplegia
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
hereditary spastic paraplegia 28
Inheritance: AR Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae), Orphanet, G2P

DDHD1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -13 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0049996376).

BP6

Variant 14-53046803-C-T is Benign according to our data. Variant chr14-53046803-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 696302.

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.000119 (18/151468) while in subpopulation SAS AF = 0.0023 (11/4788). AF 95% confidence interval is 0.00129. There are 1 homozygotes in GnomAd4. There are 12 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAdExome4 at 5 AR gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001160148.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
DDHD1	NM_001160148.2	MANE Select	c.2668G>A	p.Asp890Asn	missense	Exon 13 of 13	NP_001153620.1	Q8NEL9-1
DDHD1	NM_001160147.2		c.2605G>A	p.Asp869Asn	missense	Exon 13 of 13	NP_001153619.1	Q8NEL9-4
DDHD1	NM_030637.3		c.2584G>A	p.Asp862Asn	missense	Exon 12 of 12	NP_085140.2	Q8NEL9-2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
DDHD1	ENST00000673822.2	MANE Select	c.2668G>A	p.Asp890Asn	missense	Exon 13 of 13	ENSP00000500986.2	Q8NEL9-1
DDHD1	ENST00000357758.3	TSL:1	c.2584G>A	p.Asp862Asn	missense	Exon 12 of 12	ENSP00000350401.3	Q8NEL9-2
DDHD1	ENST00000556027.5	TSL:1	n.3175G>A		non_coding_transcript_exon	Exon 9 of 9

Frequencies

GnomAD3 genomes

AF:

0.000119

AC:

AN:

151376

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00229

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000103

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000315

AC:

AN:

247406

AF XY:

0.000463

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000111

Gnomad FIN exome

AF:

0.0000464

Gnomad NFE exome

AF:

0.0000623

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000174

AC:

254

AN:

1457904

Hom.:

Cov.:

AF XY:

0.000226

AC XY:

164

AN XY:

725340

show subpopulations

African (AFR)

AF:

0.0000301

AC:

AN:

33254

American (AMR)

AF:

0.00

AC:

AN:

44248

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26020

East Asian (EAS)

AF:

0.0000507

AC:

AN:

39442

South Asian (SAS)

AF:

0.00189

AC:

162

AN:

85688

European-Finnish (FIN)

AF:

0.0000188

AC:

AN:

53302

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5756

European-Non Finnish (NFE)

AF:

0.0000757

AC:

AN:

1109954

Other (OTH)

AF:

0.0000664

AC:

AN:

60240

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.485

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000119

AC:

AN:

151468

Hom.:

Cov.:

AF XY:

0.000162

AC XY:

AN XY:

73924

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41272

American (AMR)

AF:

0.00

AC:

AN:

15238

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5152

South Asian (SAS)

AF:

0.00230

AC:

AN:

4788

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10294

Middle Eastern (MID)

AF:

0.00

AC:

AN:

290

European-Non Finnish (NFE)

AF:

0.000103

AC:

AN:

67956

Other (OTH)

AF:

0.00

AC:

AN:

2094

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.478

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000282

Hom.:

Bravo

AF:

0.0000302

ExAC

AF:

0.000354

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

ClinVar submissions

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

Hereditary spastic paraplegia (1)

Hereditary spastic paraplegia 28 (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.069

BayesDel_addAF

Benign

-0.58

BayesDel_noAF

Benign

-0.62

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.0082

Eigen

Benign

-0.34

Eigen_PC

Benign

-0.29

FATHMM_MKL

Benign

0.38

LIST_S2

Benign

0.79

M_CAP

Benign

0.0051

MetaRNN

Benign

0.0050

MetaSVM

Benign

-1.1

MutationAssessor

Benign

1.4

PhyloP100

0.92

PrimateAI

Benign

0.38

PROVEAN

Benign

-0.62

REVEL

Benign

0.084

Sift

Benign

0.12

Sift4G

Benign

0.13

Polyphen

0.99

Vest4

0.11

MVP

0.18

MPC

0.43

ClinPred

0.044

GERP RS

4.1

Varity_R

0.039

gMVP

0.35

Mutation Taster

=97/3

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over